The R148 road is one of Ireland's regional roads which was classified following the opening of a by-passed national primary road.
The R132 road is one of Ireland's newest regional roads, having been classified following the opening M1 motorway which by-passes most of the old N1 route. The R132 is 98.9 kilometres (61.5 mi) long.
The R446 road is a regional road in Ireland. The road connects Kinnegad in County Westmeath to Galway City. Prior to the construction of the M6 motorway the R446 formed the main N6 road connecting Dublin and Galway. Following the opening of the M6; the old N6 road was downgraded to regional road status and was designated as the R446. The road is an alternative route between Galway and Dublin and runs in parallel to the M6.
The R135 road is one of Ireland's newest regional roads, being a reclassification of those sections of the former N2 which were bypassed when the N2(M2) Ashbourne By-Pass dual carriageway opened in 2006, and when the Carrickmacross, Castleblayney & Monaghan bypasses were completed.
The R108 road is a regional road in Ireland, linking Drogheda in County Louth to Christchurch Place, Dublin.
The R415 road is a regional road in Ireland, which runs north-south from its junction with the R403 in Allenwood to the R448 at Crookstown, passing through Kildare town, and crossing the N78 between Kilcullen and Athy. The route is entirely within County Kildare.
The R448 road is a regional road in Ireland. It is the designation given to the former N9 national primary road when it was bypassed by the M9 motorway.
The R125 road is a regional road in Ireland, linking Kilcock on the County Meath / County Kildare border to Swords in County Dublin via the towns of Dunshaughlin and Ratoath.
The R114 road is a regional road in south Dublin, Ireland. The road runs from the city centre to Brittas in remote southwest County Dublin via Rathmines, Rathgar, Rathfarnham, Knocklyon, Firhouse and the mountainous area of Boharnabreena. The final stretch of the road runs just north of the border between County Dublin and County Wicklow, parallel to the Brittas River and a canal to the River Camac, which rises just to the north.
The R147 is a regional road in Ireland. Its first section runs from St Peters Church in Phibsborough, Dublin to its junction with the M50. It then follows the route of a former section of the N3 between Clonee and Kells. It serves as an alternative route for non-motorway traffic and traffic wishing to avoid tolls on the M3.
The R102 road is a regional road in Dublin, Ireland, which describes a broad arc across the north of the city, connecting the N3 — at its M50 motorway intersection — to the R107 on the other side of the city.
The R103 road is a regional road in north Dublin, Ireland, passing through Finglas, between Ballymun and Glasnevin, then passing Donnycarney before reaching Killester at the Howth Road. A major stretch of the road forms Collins Avenue.
The R104 road is a regional road in north Dublin, Ireland. The road passes through Finglas, Santry, and Coolock, along the northern edge of Raheny and finishes at the coast in Kilbarrack.
The R106 road is a regional road in north Dublin, Ireland. It runs from Sutton, passing Baldoyle, Portmarnock and Malahide before finishing in Swords.
The R121 road is a regional road in south County Dublin and Fingal, Ireland.
The R127 road is a regional road in Fingal, Ireland.
The R128 road is a regional road in Fingal, Ireland.
The R805 road is a regional road in Dublin, Ireland.
The R311 road is a regional road in west central County Mayo in Ireland. It connects the R310 road at Castlebar to the N59 road at Newport, 18.1 kilometres (11.2 mi) away.
The R332 road is a regional road in County Galway and County Mayo in Ireland. It connects the N63 road at Horseleap Cross near Moylough in County Galway, via Tuam, to the N84 road at Kilmaine in County Mayo, 38 kilometres (24 mi) away.
